var Q = require('q'),
    et = require('elementtree'),
    fs = require('fs'),
    shell = require('shelljs'),
    path = require('path');

module.exports = {
    add: function( platformName ) {
        var pluginxml,
            platform;

        //check to make sure we are in the plugin first
        if( !fs.existsSync( 'plugin.xml' ) ) {
            return Q.reject( new Error( "can't find a plugin.xml.  Are you in the plugin?" ) );
        }

        //Get the current plugin.xml file
        pluginxml = et.parse( fs.readFileSync('plugin.xml', 'utf-8') );

        //Check if this platform exists
        if( pluginxml.find("./platform/[@name='"+ platformName +"']") ) {
            return Q.reject( new Error( "platform: " + platformName + " already added"  ) );
        }

        //Get the platform specific elements
        platform = doPlatform( platformName, pluginxml.find("./name").text, pluginxml.getroot().get( "id" ) );

        //Make sure we support it
        if( !platform ) {
            return Q.reject( new Error( "platform: " + platformName + " not yet supported"  ) );
        }

        pluginxml.getroot().append( platform.getroot() );

        fs.writeFileSync( "plugin.xml", pluginxml.write( "plugin.xml", {indent: 4} ), 'utf-8' );
        return Q();
    },
    remove: function( platformName ) {
        //check to make sure we are in the plugin first
        if( !fs.existsSync( 'plugin.xml' ) ) {
            return Q.reject( new Error( "can't find a plugin.xml.  Are you in the plugin?" ) );
        }

        //Get the current plugin.xml file
        pluginxml = et.parse( fs.readFileSync('plugin.xml', 'utf-8') );

        //Check if this platform exists
        if( !pluginxml.find("./platform/[@name='"+ platformName +"']") ) {
            return Q.reject( new Error( "platform: " + platformName + " hasn't been added"  ) );
        }

        //Remove the Platform in question
        pluginxml.getroot().remove( 0, pluginxml.find("./platform/[@name='"+ platformName +"']") );

        //Rewrtie the plugin.xml file back out
        fs.writeFileSync( "plugin.xml", pluginxml.write( "plugin.xml", {indent: 4} ), 'utf-8' );

        //Remove the src/"platform"
        shell.rm( '-rf', 'src/' + platformName );

        return Q();
    }
};

function doPlatform( platformName, pluginName, pluginID, pluginVersion ) {
    var docDir = path.join(__dirname, '..', 'doc/platforms/' + platformName + "/"),
        platformFile = docDir + platformName + ".xml",
        platform;

    if( !fs.existsSync( platformFile ) ) {
        return false;
    }

    platform = fs.readFileSync( platformFile, 'utf-8' )
                .replace( /%pluginName%/g, pluginName )
                .replace( /%pluginID%/g, pluginID )
                .replace( /%packageName%/g, pluginID.replace( /[.]/g, '/' ) );
    platform = new et.ElementTree( et.XML( platform ) );

    doPlatformBase( docDir, platformName, pluginName, pluginID, pluginVersion );

    return platform;
}

function doPlatformBase( docDir, platformName, pluginName, pluginID, pluginVersion ) {
    //Create the default plugin file
    var baseFiles = [],
        i = 0;

    switch( platformName ) {
    case 'android':
        baseFiles.push (
            {
                file: fs.readFileSync( docDir + "base.java", "utf-8" )
                    .replace( /%pluginName%/g, pluginName )
                    .replace( /%pluginID%/g, pluginID ),
                extension: "java"
            }
        );

        break;
    case 'ios':
        baseFiles.push(
            {
                file: fs.readFileSync( docDir + "base.m", "utf-8" )
                    .replace( /%pluginName%/g, pluginName ),
                extension: "m"
            }
        );
        break;
    }

    shell.mkdir( '-p', 'src/' + platformName );

    for( i; i < baseFiles.length; i++ ) {
        fs.writeFileSync( 'src/' + platformName + '/' + pluginName + '.' + baseFiles[ i ].extension, baseFiles[ i ].file, 'utf-8' );
    }

}